<template>
  <div>
    <div v-for="(item, index) in arr" :key="index">
      <input type="checkbox" name="" id="" v-model="newArr" :value="item" />
      <span>{{ item }}</span>
    </div>
    <p>你选中的元素加起来是{{ ative }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      newArr: [],
    }
  },
  // 计算
  computed: {
    ative() {
      return this.newArr.reduce((sum, item) => (sum += item), 0)
    },
  },
}
</script>

<style></style>
